D3.js动画旋转 [英] D3.js animate rotation
问题描述
当我尝试使用D3.js库正确执行旋转动画时遇到问题。问题与我要旋转元素的点有关。
这里是一个小提琴,我用来表示我的意思(慢动作): http://jsfiddle.net/74mCb/
似乎问题的根源在这里:
.attr(transform,rotate(-60,150,130 ));
然后我这样旋转:
.attr(transform,rotate(40 150,130));
我希望针的针踵保持在原位(旋转中心)
p>这是有点棘手掌握(我不完全理解它自己),但D3需要一些帮助知道如何内插在表示你的旋转的两个字符串之间。
function turnNeedle()
{
needle
.transition()
.duration(2000)
.attrTween(transform,tween);
function tween(d,i,a){
return d3.interpolateString(rotate(-60,150,130),rotate(60,150,130)) ;
}
}
d
是数据, i
是索引, a
使这个数据驱动。
I'm having trouble when I try to correctly execute a rotation animation using the D3.js library. The problem has to do with the point at which I want to rotate the element about.
Here is a fiddle I made to show what I mean (in slow motion): http://jsfiddle.net/74mCb/
It seems like the source of the problem lies here:
.attr("transform", "rotate(-60, 150,130)");
And then I rotate it like so:
.attr("transform", "rotate(40 150,130)");
I would like the butt of the needle to stay in position (to be the center of rotation), could someone please explain what I am doing wrong?
Thanks!
This is a bit tricky to grasp (I don't fully understand it myself) but D3 needs some help knowing how to interpolate between the two strings that represent your rotation.
function turnNeedle()
{
needle
.transition()
.duration(2000)
.attrTween("transform", tween);
function tween(d, i, a) {
return d3.interpolateString("rotate(-60, 150, 130)", "rotate(60, 150, 130)");
}
}
d
is the datum, i
is the index, a
is the attribute in case you want to make this data-driven.
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